A cap cloud loomed over Mount Rainier on Friday morning, as seen from the KING 5 Tacoma tower camera.
SEATTLE — Even a clear sky contains layers of wet and dry air, that is, layers with different humidities. You can’t see these layers unless the humidity is high enough for the moisture in the layer to condense and form a cloud. Often, you may have a wet layer of air sandwiched between two or more dry layers.
If the wind blows these layers into an obstacle like Mt. Rainier, the layers have to go up and over it. When layers of air go up, they cool
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